Does Ontario offer Preapproved ADU Plans?
The City does not provide City Preapproved Plans for download; however, those homeowners interested in a lower-cost and more expeditious way to build an ADU may use a preapproved ADU plan prepared by a private vendor. For this option, contact one or more of the preapproved ADU vendors listed below to learn about their plans, pricing, and installation approach. Be sure to confirm the vendor's role in submitting the plans and securing the building permit. Also, it is highly advised that you have the vendor or contractor pull the permits. This keeps the liability for the work with the professional service. Furthermore, the information below is not intended to be an endorsement of the vendor.
Vendor List: COMING SOON
For projects with no changes to the Preapproved ADU Plans: A completed Building Permit Application along with all items listed in the ADU Plan Submittal Requirements handout shall be prepared and must be submitted electronically to the Building Department through Ontario’s Citizen Portal Access website. Please note that all plans shall be labeled “Preapproved ADU Plans.” Upon confirmation of receiving a complete application, the City will then proceed to plan check the submittal within 30 days.
For projects with changes to the Preapproved ADU Plans: Making changes to a preapproved ADU plan will disqualify it as a preapproved ADU and expedited review cannot be provided. It should also be noted this may require additional cost and can add a significant amount of time during the review process. To submit a preapproved plan that proposes changes, a completed Building Permit Application along with all items listed in the ADU Plan Submittal Requirements handout shall be prepare and must be submitted electronically to the Building Department through Ontario’s Citizen Portal Access website.
How can Vendors apply for Preapproved ADU Plans?
Vendors can apply for preapproved ADU plans that are not site-specific by following the instructions provided in the Preapproved ADU Plan Approval Process handout. This requires preparation of all items listed in the handout, followed by a preliminary meeting with the Building Department to discuss plans and submittal process. Please note, Building Department plan check fees will be applied.